FVXX21 KWBC 040220
VOLCANIC ASH ADVISORY STATEMENT
ISSUED 0220 UTC 04 JAN 2000 BY THE WASHINGTON VAAC
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TUNGURAHUA 00-014 ECUADOR 0128S 7826W
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BACKGROUND: TUNGURAHUA ECUADOR (1502-08)
SUMMIT HEIGHT 16480 FT (5023 M)
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SOURCES OF INFORMATION: GOES-8 VISIBLE..INFRARED..AND MULTISPECTRAL
IMAGERY. WIND FORECAST FROM THE 03/1200 UTC AVIATION MODEL. 03/1200
UTC UPPER WIND MEASUREMENTS FROM THE GEOPHYSICAL INSTITUTE. SURFACE
REPORTS FROM STATION SEAM.
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ERUPTION DETAILS: CONTINUOUS ASH AND STEAM EMISSIONS.
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DETAILS OF ASH: SATELLITE IMAGERY THROUGH 04/0115 UTC SHOWS THAT THE
ASH PLUME IS BECOMING MORE DIFFUSE AND DIFFICULT TO SEE. THE 03/2315
UTC IMAGE DEPICTED THE PLUME BEST AND WAS USED FOR THE ANALYSIS.
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THE ASH EXTENDED SOUTHWEST FROM TUNGURAHUA. THE PLUME WAS 74 KM (42
NMI) LONG...REACHING THE POINT 0201S 7848W...AND 13 KM (7 NMI) WIDE.
THE ASH IS ESTIMATED TO BE BETWEEN FL300 AND FL350. ALTHOUGH UPPER
AIR WIND MEASUREMENTS AND MODEL DATA INDICATE WINDS BLOWING FROM THE
SOUTHEAST TO NORTHWEST BETWEEN FL200 AND FL300 THERE IS NO
INDICATION IN SATELLITE IMAGERY OF ANY ASH EXTENDING TO THE
NORTHWEST OF THE VOLCANO.
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TRAJECTORY: UPPER AIR PATTERNS SUGGEST ASH BETWEEN FL300 AND FL350
WILL MOVE TO THE SOUTHWEST AT 10 TO 15 KNOTS.
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REAL TIME SATELLITE IMAGERY ALONG WITH THIS AND OTHER VOLCANIC ASH
ADVISORY STATEMENTS OFTEN ACCOMPANIED BY A MAP DEPICTING ASH
LOCATION ARE AVAILABLE AT INTERNET URL ADDRESS
http://www.ssd.noaa.gov/VAAC/washington.html
(all lower case except /VAAC/)
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OUTLOOK: SEE SIGMETS AND VAFTAD.
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EFFECTIVE JANUARY 3 2000 AT 0000 UTC... ALL REFERENCES TO LATITUDE
AND LONGITUDE IN VOLCANIC ASH ADVISORY STATEMENTS WILL BE IN DEGREES
AND MINUTES OF A DEGREE. EXAMPLE: 16.70N 62.20W WILL BE 1642N6212W
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THE NEXT STATEMENT WILL BE ISSUED BY 04/0800 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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RUMINSKI/NOAA/NESDIS/SAB
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NNNN
"Attached Graphic Map Depicting Ash"